How to Authenticate and POST to /v1/call Endpoint in Retell AI for Outbound Twilio Calls

Apr 5 · 15 min read · How to Authenticate and POST to /v1/call Endpoint in Retell AI for Outbound Twilio Calls TL;DR Most outbound call integrations fail at authentication or payload validation. Here's what breaks: missing Bearer tokens, malformed E.164 phone numbers, and...